Apparatus for electric welding



G. H. FORSYTH.

APPARATUS FOR ELECTRIC WELDING.

APPLICATION FILED MAY 3, 1915- 13755 7, Patented Apr. 26, 1921;

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-Be-it known that I, GEoneEI-I; FoRsx'rH, a citizen of the United States, residing at Chicago, iii-the county of Cook and State of Illinois, have invented certain new-and useful Improvements in Apparatus for.

Electric Welding, of which the following is I vantageousas appliedj-fzi-nthe-welding of a specification. 1

The invention has for its primary object the application of-a weldingiheatgatolthe abutting edges 1 of members havinganfexs tended area of contact in" such manner-as to bring 'all the meeting portions over such extended area to a welding temperature. D Y h a I showing the nventlon as applied to'the hub,

simultaneously.

A characteristicieature ofj theli'nvention is the provision of means whereby the heat in'g medium,whether a flame or an electr c current, is applied 'jsimultan'e'ou'sly through. out theextent of the abutting surfaces and also c onfinedlocally thereto asidistinguished from the application of welding heatprdf, gressi'vely along, the meeting line of, sur-jg faces to be welded and from-theapplication abutting edges. v Where'exten'dedf areas. are to be, un ted and particularly in; the cas'elof surfaces divided into a number of-isolated' portions as typified .by; metal wheel construction it has been found to be exceedinglydiflicult vto efiect aj-uniform junctionf-of parts"forl thef reason that in the-welding the heated portions yield toward each othernn'der the" pressure of the clamping members while those-portions which havef ot yet been sub-- ,.jected to the welding heat resist ithe-clamping actionfiand maintain their original e l-. tion thus leading to 'adeformation-with a1";- resultant-lackof 's'ymmetry in the completed 'articlelfi,

It has been proposed tojweldhav-- ing an extended line of contactby constitutingi the-two portions tobe welded the positive and negative electrodes' of a weld-' ing electric current. In such cases, however, the waste of current has been enormous owing'to the heating of the wholearticle in order .to bring its abutting edges to 'a welding temperature: v n Y According to the present invention these obj ections are overcome-by heat in the abutting edges simultaneously. throng out their extent and at the same time confining the applicationof heat locally along the line of -the line seas- 3,

. QIatented Apr.- 26, 1921.

Application filed May 3, 1915.?s3ria in. 25,355

contact and,*-in the case ofel'ectric current,

bringing the electrodes-into contact with the" article immediately adjacent the line of contactso' that the article. is heated n1 along j-its abutting edges. j

While the invention is'thus a plicable a a. wide range .of. uses", it is particularly ad: 1

sheetmetal halves of variousobjects such for instance asjsheet s'teelflwheels for vehicles and it isin connection with such use that 'theinvention isherein illustrated and derim, and'spokes o'f a sheetmetal wheel;

' Figs. 2, 3 andi lare'trans'verse; sections on and -Hrespectively of F l; L

Fig. ,5-is a view similar to Fig. 4 but of a modification,

As illustrated the i reference numerals 11 and '11 represent cooperating hub portions of, the upper and lowerhalVes -ofa sheet of anelectriccurrent, fer instance, to the metal wheel, 12 and '12 the spoke portions article at a considerabledistance from the and Band 13 Jthe rim portions of the upper andlower halves, thesaid upper and lower of the upper and lower halves respectively,

The clamping members have a face contour conformingmarginallyj'to that of the hub, spoke and rimjportions of thewheel halves so ,as tomaintain thewheel halves in appropriatev pressure contact without deformation, the mai'-gins". of. the clamping members having a"is'paced-'relation to each other.

1 .Alongtheir margins, havingre ferenceto Figs. ,ljto' l- 'inclusive; the upper-and Ilower clamping members carry. positive and neg'a tive'felectrodes 15, 15?, which; form acon-1 'tinuation of; the clamping members but: are isQlatedztherefr0m "by insulation 16, 16. These electrodesalare in electrical. contact with the upper and, lower"halves of the the electrode 15 through the marginalpor-v tion of the wheel halves to the electrode 15,

to a welding heat without the current being wheel portions immediately 1 adjacent the h r10 bringin'g the abutting edges of the halves: i I

dissipated through the body of the articles or wasted in heating the same other than locally.

Referring to ,Fig. 5, I have illustrated the application of the same principle in a slightly different manner. Herein the clamping members numbered 17 and 17 form no part of the means for applying a current but serve only to confine the wheel halves against separation during welding.

In this embodiment the electrodes 18 and 18 are applied one within and the other without the meeting edges of the article, the application of the current being confined locally along the line of contact by means of the.

insulation 19, although the same result might be obtained in this form of the invention by so shaping the electrodes that they would contact" with the wheel halves only along a limited area including the abutting edges of the parts. Having reference to: this figure the electrodel8 might well be in the form of a continuous band lying within the rim'of the wheel While the electrode 18 represents oneof a plurality of triangular shaped electrodes fitting Within the spaces between the several spokes.

In both forms of construction the operation is the same, the current being applied to the electrodes, the welding operation will take place simultaneously throughout the extended line of surfaces in abutting contact, and being confined locally to such line of contact the current will be conserved and the operation will be both efficient and economical. Moreover, by reason of the holding of the surfaces in pressure contact so that the. heated edges will yield and approach one another, the use of a wire insert in the space between the edges, as is usual in flame welding, is obviated.

2. In an apparatus for welding articles having an extended line of abutting surfaces, clamping members for holdingthe abuttin'gsurfaces in pressure contact, and electrodes carried by said members and forming a part of but insulated from the 7 main body thereof, the electrical contact between the electrodes and the articles to be welded being-confined locally adjacent the abutting surfaces.

4 3. In an apparatus for welding articles having an extended line of abutting surfaces, a pair of opposed clamping members, and a pair of electrodes carried by but insulated from the'clamping members and contacting with the articles adjacent the line of contact therebetween.

4. In an apparatus for Welding articles having an extended line of abutting surfaces throughout the line of contact simultaneously, a pair of opposed clamping members for holding the surfaces in contact, and a pair of electrodes carried by but insulated from the clamping members and contacting with the articles adjacent and throughout the extent of the line of contact therebetween.

5. In an apparatus for welding articles having an extended line of abutting edges,

clamping members arranged on opposite sides of the line of contact between the articles, and electrodes, the electrical contact between the electrodes and the articles to be welded-being confined locally adjacent the abutting edges.

6. In an apparatus for welding articles having an extended line of abutting surfaces, a pair of opposed clamping members acting in a line substantially normal to the abutting surfaces, and a pair of electrodes carried by but insulated from the clamping members and contacting with the articles adjacent the line of contact therebetweeni In .testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

v GEORGE H. FORSYTH.

Witnesses i M. C. Bizowna, T. D. BUTLER. 

